The oldest member of the family is the _Lar Familiaris_ of the Romans. There is a noticeable resemblance between _lar_, the Roman household deity, and _làrach_ (from _làr_, the ground), the Gaelic for the stance or site of a building, to which, and not to the tenants, the Celtic household apparition attached itself. The _lares_ of the Romans were the departed spirits of ancestors, which were believed to watch over their dependents. The Glaistig was held to have been a woman of honourable position, a former mistress of the house, the interests of the tenants of which she now attended to. Small waxen images of the _lares_, clothed with the skin of a dog, were placed in the hall. The Glaistig had the Fairy aversion to dogs (an aversion which was reciprocal), but many of the actions ascribed to her savour strongly of her being in some way identical with the herdsman’s dogs. This would very well explain the pouring of milk for her in the evening in the hollow of a stone. The Glaistig of Ardnadrochit had the shape of a dog (see p. 175). A satisfactory explanation of the origin of the superstition does not readily suggest itself. In days when men did not know what to believe in regarding the spirit world, and were ready to believe anything, a fancy may have arisen, that it secures the welfare of a house, and adds to its dignity, to have a supernatural being attached to it and looking after its interests. It had its origin after the tribes, among whom it is to be found, ceased to be roving and unsettled barbarians. In a large establishment a being of the kind was very useful. The master would not discredit its existence, as it helped to frighten idle and stupid servants into attending to their work and into clean and tidy habits. Shrewd servants would say as little against it when it served so well to screen their own knavery or faults, and to impose on a credulous and facile, or careless master. Unless it was sometimes seen or heard, or some work was mysteriously done, the delusion, either of master or servant, could not be long continued; and, when men have little else to do, there are many who take a pleasure in imposing on their more simple-minded fellows, and are quite ready, as much from sport as interest, to carry on a delusion of the kind. Besides, when the mind is nervously anxious, engrossed with the fear of a coming misfortune or the hope of a coming joy, it is apt to listen to the whispers of fancy and the confidently-told tales of others. When it broods alone, during the sleepless night, over the future it is not surprising if the imagination converts the weird sounds of night—the melancholy moaning of the wind, its fitful gusts in the woods and round the house, the roar of the waterfall, the sound of the surf-beaten shore, and many noises, of which the origin is at the time unknown and unsought—into the omens of that which makes itself sleepless, or hears in them the song of the house-spirit, prescient of the coming event.